The goal of this book is to teach you to think like a computer scientist. This way of thinking combines some of the best features of mathematics, engineering, and natural science. Like mathematicians, computer scientists use formal languages to denote ideas (specifically computations). Like engineers, they design things, assembling components into systems and evaluating tradeoffs among alternatives. Like scientists, they observe the behavior of complex systems, form hypotheses, and test predictions.

Think Python is an introduction to Python programming for beginners. It starts with basic concepts of programming, and is carefully designed to define all terms when they are first used and to develop each new concept in a logical progression. Larger pieces, like recursion and object-oriented programming are divided into a sequence of smaller steps and introduced over the course of several chapters.

This book is a practical guide to adapting or creating open textbooks using the PressBooks platform. It is continually evolving as new information, practices and processes are developed. The primary audience for this book are faculty and post-secondary instructors in Saskatchewan, Canada who are developing, adapting or adopting open textbooks at the University of Saskatchewan. However, there may be content within this book that is useful to others working on similar Open Educational Resource initiatives.

Diagnostic Imaging principles and concepts are augmented by the presentation of imaging for common clinical conditions. Guiding principles related to minimizing radiation exposure and requesting the most appropriate imaging examination is addressed. Static images are enhanced by the ability to access images stored and displayed on an Html-5 compatible, Dicom image viewer that simulates a simple Picture Archive and Communication system (PACS). Users can also access other imaging from the Dicom viewer (ODIN), beyond the basic curriculum provided, to further advance their experience with viewing diagnostic imaging pathologies.This book is also available in three other digital formats: ePUB (for Nook, iBooks, Kobo etc.), PDF (regular print), PDF (large print).

University Physics is a three-volume collection that meets the scope and sequence requirements for two- and three-semester calculus-based physics courses. Volume 1 covers mechanics, sound, oscillations, and waves. Volume 2 covers thermodynamics, electricity and magnetism, and Volume 3 covers optics and modern physics. This textbook emphasizes connections between between theory and application, making physics concepts interesting and accessible to students while maintaining the mathematical rigor inherent in the subject. Frequent, strong examples focus on how to approach a problem, how to work with the equations, and how to check and generalize the result.

University Physics is a three-volume collection that meets the scope and sequence requirements for two- and three-semester calculus-based physics courses. Volume 1 covers mechanics, sound, oscillations, and waves. Volume 2 covers thermodynamics, electricity and magnetism, and Volume 3 covers optics and modern physics. This textbook emphasizes connections between theory and application, making physics concepts interesting and accessible to students while maintaining the mathematical rigor inherent in the subject. Frequent, strong examples focus on how to approach a problem, how to work with the equations, and how to check and generalize the result.

Our primary goal in writing University Success is to help you succeed in university. This is a how-to manual for your first year of study.

Most of us will have heard the term Ballistics at some time or other - more often than not when we have been watching fictionalised accounts of police work on television or in the cinema.

What is Ballistics?
Ballistics is the area of Forensic Science that deals with firearms; how they are used, why they are used and why they are used frequently in the practice of murder.

What many people do not realise is that when a person is shot the wound and the condition of the victim can tell a lot about the nature of the weapon that has been used. Indeed if the weapon has been left at the scene of the crime - which sometimes happens when the perpetrator panics - the weapon itself can go a long way to providing valuable information as to the kind of person who has committed the offence.

Identifying a Weapon
Most guns have their own unique identifying features and even if the gun has not been left at the crime scene many degrees of information can be determined from the bullet, the nature of the wound and any residue that is left around it.

Bullets contain a mixture of gunpowder and cordite and these leave burn marks on the skin of the individual either wounded or killed, they also leave a fine residue on the fingers and hands of the individual firing the gun. These burn marks can signify closeness of the victim to the perpetrator, kind of weapon and also if the weapon has had any modifications made to it. Some weapons have been disarmed by having the firing pins and mechanisms removed but there are individuals who can 'reactivate' these weapons for use again.
Also, each weapon's barrel contains small ligatures and grooves, which, when a bullet is fired from them, make marks on the shell casing, which can be used as a means of identifying the make and model of gun if these shell casings are found at the scene.
It is also worth noting that an automatic - or semi automatic weapon - will expel shell casings as the weapon fires a round whereas a revolver will fire the round but retain the shell casing within the barrel.

Investigating
The field of ballistics is able to identify rifling patterns, marks made by using suppressors (silencers), shell casings, powder burn and many other different areas relating to the use of firearms and the evidence they leave behind.

Indeed most ballistics experts will be able to tell you the particular weapon simply by the sound of it being fired. They will also be able to carry out distance and depth tests which include firing rounds of ammunition into water, sand and other substances to determine how close a person would have to be to receive a life threatening wound from a gun.
Ballistics is a very important part of the world of Forensic Science and much of its evidence is used in criminal proceedings. In some cases the use of ballistics research can prove a link between many different crimes carried out over a lengthy period of time. This is also an important function of the ballistics team as many weapons are passed and sold on between criminals during their life cycle.

This is episode 4 of Mr. Smith’s science lessons from his basement during the COVID-19 social isolation period. This is grade 7 science, the earths crust